<template>
 <div class="list" ref="wrapper">
   <div>
   	<div class="area">
         <div class="title border-topbottom">当前城市</div>
         <div class="button-list">
            <div class="button-wrapper">
               <div class="button">{{this.currentCity}}</div>
            </div>
         </div>
      </div>
      <div class="area">
         <div class="title border-topbottom">热门城市</div>
         <div class="button-list">
            <div
              class="button-wrapper"
              v-for="item of hot"
              :key="item.id"
              @click="handleCityClick(item.name)"
            >
               <div class="button">{{item.name}}</div>
            </div> 
         </div>
      </div>
      <div 
         class="area" 
         v-for="(item,key) of cities" 
         :key="key"
         :ref="key"
      >
         <div class="title border-topbottom">{{key}}</div>
            <div class="item-list">
               <div class="item border-bottom" 
                    v-for="innerItem of item" 
                    :key="innerItem.id"
                    @click="handleCityClick(innerItem.name)"
               >
                    {{innerItem.name}}
               </div>             
            </div>
         </div>
      </div>
   </div>
 </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
	name: 'CityList',
   props: {
      hot: Array,
      cities: Object,
      letter: String
   },
   methods: {
    handleCityClick (city) {
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
   },
   computed: {
    ...mapState({
      currentCity:'city'
    })
   },
   watch: {
      letter () {
        if (this.letter) {
         const element=this.$refs[this.letter][0]
         this.scroll.scrollToElement(element)
        } 
      }
   },
   mounted () {
      this.scroll = new Bscroll(this.$refs.wrapper, { mouseWheel: true, click: true, tap: true })
   },
}
</script>

<style lang="stylus" scoped>
 @import '~styles/varibles.styl'
 .border-topbottom
    &:before
       border-color: #ccc
    &:after
       border-color: #ccc
 .border-bottom
    &:before
       border-color: #ccc
.list
   overflow:hidden
   position: absolute
   top: 1.58rem
   left: 0
   right: 0
   bottom: 0
   .title
       line-height: .54rem
       background-color: #eee
       padding-left: .2rem
       color: #666
       font-size: .26rem
    .button-list
       overflow: hidden
       padding: .1rem .6rem .1rem .1rem
       .button-wrapper
          float: left
          width: 33.33%
          .button
             text-align: center
             padding: .1rem 0
             margin: .1rem
             border: .02rem solid #ccc
             border-radius: .06rem
   .item-list
      .item
         line-height: .76rem
         color: #666
         padding-left: .2rem
       
</style>